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A7800-Mega-Adapter

tebl·A7800-Mega-Adapter

A7800-Mega-Adapter PCB layout, top view — open source board by tebl
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About the A7800-Mega-Adapter PCB

A7800-Mega-Adapter is an open source PCB design by tebl, published on GitHub under the CERN-OHL-1.2 license. It is a 2-layer board measuring 30.5 × 31.8 mm, with 6 components from 3 distinct parts.

By type, the board carries 4 resistors and 2 transistors.

It belongs with the retro computing designs in this gallery.

From the project

Adapter for using a wired Sega Mega Drive/Genesis controller on an Atari 7800.

I based this project on the FAQ over at AtariAge.com, so if the design looks like something you've seen before then that's probably the reason why. I've built it up and tested it on my Atari 7800 PAL system, seems to work pretty good with the wired 3-button controller (don't have a 6-button variant to test out with). Unfortunately it doesn't seem to work with the new wireless 8bitdo controllers, but at least I finally get to test out some of the games without my hands aching and turning intolerable after 5-minutes of game time.

A7800-Mega-Adapter, from the project README
From the project README

A7800-Mega-Adapter bill of materials (BOM)

6 components, 3 distinct parts.

QtyPartRefs
2
2N3906
Q1, Q2
2
620
R1, R3
2
1k
R2, R4

A7800-Mega-Adapter design files

The KiCad project lives in the tebl/A7800-Mega-Adapter repository on GitHub; these links point at the commit this page was built from.

A7800-Mega-Adapter: common questions

How big is the A7800-Mega-Adapter PCB?

The A7800-Mega-Adapter measures 30.5 × 31.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the A7800-Mega-Adapter?

6 components, from 3 distinct parts. The full bill of materials is listed on this page.

Where can I download the A7800-Mega-Adapter design files?

From the tebl/A7800-Mega-Adapter repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the A7800-Mega-Adapter design in my own project?

Yes, under the terms of its CERN-OHL-1.2 license, which tebl chose for the repository.

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